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https://www.cdc.gov/niosh/topics/noise/reducenoiseexposure/regsguidance.html
Sep 13, 2000 · The NIOSH REL for noise is 85 decibels, using the A-weighting frequency response (often written as dBA) over an 8-hour average, usually referred to as Time-Weighted Average (TWA). Exposures at or above this level are considered …
https://www.osha.gov/noise
Here's an example: OSHA allows 8 hours of exposure to 90 dBA but only 2 hours of exposure to 100 dBA sound levels. NIOSH would recommend limiting the 8 hour exposure to less than 85 dBA. At 100 dBA, NIOSH recommends less than 15 minutes …
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.95
For purposes of paragraphs (c) through (n) of this section, an 8-hour time-weighted average of 85 decibels or a dose of fifty percent shall also be referred to as the action level. 1910.95(d) "Monitoring." 1910.95(d)(1) When information indicates that any employee's exposure may equal or exceed an 8-hour time-weighted average of 85 decibels ...
https://www.asha.org/public/hearing/Loud-Noise-Dangers/
Sounds at 85 dBA can lead to hearing loss if you listen to them for more than 8 hours at a time. Sounds over 85 dBa can damage your hearing faster. The safe listening time is cut in half for every 3-dB rise in noise levels over 85 dBA. For example, you can listen to sounds at 85 dBA for up to 8 hours.
https://www.noisehelp.com/noise-dose.html
The generally accepted standard to minimize hearing risk is based on an exposure to 85 dBA for a maximum limit of eight hours per day, followed by at least ten hours of recovery time at 70 dBA or lower (at which the risk of harm to healthy ears is negligible). Then a "3-dB exchange rate" formula is applied, which means that for every 3 dB above ...
https://www.tkontheweb.com/twacalc
Calculator determines partial and total 8-hour time-weighted average exposures and noise doses. Employee works for 2.5 hours in 90 dBA and 5.5 hours in 85 dBA. Enter 90 dBA, 2 hours and 30 minutes for location 1 and 85 dBA, 5 hours, and 30 minutes for location 2. The result for this would be a TWA of 87 dBA and a dose of 65.7%.
https://noisemeters.com/help/osha/twa/
Once you have the Dose% figure, you can calculate the TWA using the following equation: TWA = 16.61 Log10 (D/100) + 90. where. TWA is the 8-hour Time Weighted Average Sound Level D is the Dose % as calculated above (or measured with a dosimeter) Log10 is the Logarithm to base 10
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